NASA Science (Web page: Planets)
NASA is one of the most recognizable independent government agencies responsible for the study of space research in the United States. On this page, students can learn about the planet lineup, primary planets, dwarf planets, and a mysterious hypothetical planet. They even include a real-time simulation of our solar system based on their data collection.
Lunar and Planetary Insitute (Web page: Sky Tellers)
Here is a more informative and challenging resource for those who enjoy reading and have questions about various topics such as seasons, moon phases, stars, the sun, the galaxy, etc. The best part is that the website answers the most common and interesting questions that you can think of. Browse through their resources and start learning now!